RCA 70/46 User Manual

Translate
(TR)
General Description
Format
(55)
Condition Code
Interrupt Action
Logical
I nstructiQn8
• The variable length operand specified by the first address (B1/D
1
) is
translated, byte-for-byte, according to the byte translation table specified
by the second address (BdD
2
). The result replaces the bytes in the field
specified by
the first address.
The bytes of the first operand are termed the argument bytes. Bytes of
the first operand are selected for translation from left-to-right, one byte
at a time. Each argument byte is added to the second operand address,
which is
the starting location of a translation table. This sum, in turn,
addresses a byte location within the table containing a function byte. The
function byte at this location replaces the original argument byte of the
first operand.
The operation
terminates when the first operand bytes have been
exhausted.
DC L
o
7 8
15 16 19 20 31 32 35 36
47
• Unchanged.
• Address error:
Addressing.
Protection.
Notes • 1. The translation table is unaltered unless overlap occurs.
2. The field to be
translated and the translation table are addressed by
their leftmost byte.
3. The length
of a table, in general, must be 256 bytes, unless the
domain of argument bytes is limited to a specific subset by the
program and data.
4. The L field specifies the length of the first operand minus one
(binary 00000001 = 2 bytes).
182

RCA 70/46 Specifications

General

Brand	RCA
Model	70/46
Category	Computer Hardware
Language	English